05000458/FIN-2013003-02

Finding

Title

Failure to Adequately Evaluate and Correct Degraded 125 Vdc Fused Disconnect Switches

Description

The inspectors identified a non-cited violation of 10 CFR Part 50, Appendix B, Criterion XVI, Corrective Action, for the failure to identify and take prompt and adequate corrective actions to address a condition adverse to quality specifically related to the 125 Vdc fused disconnect switches located in the diesel generator building electrical distribution panels. The licensee addressed the underlying safety concern by cycling the disconnect switch to clean the corroded contact surfaces and performing voltage and current checks to verify circuitry operability. The licensee entered the finding into the corrective action program as Condition Report CR-RBS-2013-04247 The inspectors determined that this finding is more than minor because it is associated with the equipment performance attribute of the mitigating systems cornerstone and affects the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, during a seismic event the partially seated, corroded knife blades could cause a loss of safety related 125 Vdc power to the Division 1 and 2 emergency diesel generators, reactor water recirculation pumps A and B, or Division 1 and 2 remote shutdown panels. In accordance with NRC Inspection Manual Chapter 0609, Attachment 4, Initial Characterization of Findings, and NRC Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process for Findings At-Power, Exhibit 2, this finding screened as very low safety significance (Green) because the degraded condition was not a design or qualification deficiency; did not represent an actual loss of function of a system; did not represent an actual loss of function of a single train or two separate trains for greater than its technical specification allowed outage time; did not represent an actual loss of function of one or more non-technical specification trains of equipment designated as high safety significant; and did not screen as potentially risk significant due to a seismic, flooding, or severe weather initiating event. Because the most significant causal factor of the performance deficiency was the licensees failure to use consistent key words in the corrective action program to characterize the disconnect switch failures, this finding has a cross-cutting aspect in the problem identification and resolution area associated with the corrective action program component because the licensee did not periodically trend and assesses information from the CAP and other assessments in the aggregate to identify programmatic and common cause problems.

02
Site:	River Bend
Report	IR 05000458/2013003 Section 4OA2
Date counted	Jun 30, 2013 (2013Q2)
Type:	NCV: Green
cornerstone	Mitigating Systems
Identified by:	NRC identified
Inspection Procedure:	IP 71152
Inspectors (proximate)	P Elkmann A Barrett J Laughlin G Larkin J Quichocho
Violation of:	10 CFR 50 Appendix B Criterion XVI Technical Specification
CCA	P.4, Trending
INPO aspect	PI.4
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v • d • e

Finding - River Bend - IR 05000458/2013003

6(0)2(4)3(3)4(0)5(3)6(0)7(6)8(0)201(0)202(2)403(0)404(2)405(0)406(0)501(0)502(0)

IR 05000458/2013003: 1 2 3

Finding List (River Bend) @ 2013Q2

CCA Matrix: 2013Q2

	Q	CCA	Title
05000458/FIN-2012009-06	2012Q3		Implementation of the Station Cable Reliability Program
05000458/FIN-2012004-04	2012Q3	H.5	Inadequate Verification of Leading Edge Flow Meter Functionality
05000458/FIN-2012004-03	2012Q3	P.5	Failure to Appropriately Tune the Reactor Core Isolation Cooling Turbine Speed Controller
05000458/FIN-2012004-02	2012Q3	H.6	Untimely Corrective Actions to Ensure Reliability of the 480 Vac Molded Case Circuit Breakers and Unitized Motor Starters
05000458/FIN-2012004-01	2012Q3		Improper Hydrogen Igniter Breaker Trip Coil Setting
05000458/FIN-2012009-07	2012Q3		Onsite Safety Review Committee Implementation
05000458/FIN-2012009-08	2012Q3		Ability to Promptly Staff the Fire Brigade at All Times During Plant Operation
05000458/FIN-2012009-01	2012Q3		Main Control Room Annunciator Control and Conduct of Operations
05000458/FIN-2012009-02	2012Q3		Past Operability of the Reactor Core Isolation Cooling System
05000458/FIN-2012010-08	2012Q3	H.7	Failure to Prevent Conflicts of Duty for Fire Brigade Members
05000458/FIN-2012010-07	2012Q3	H.13	Loss of Onsite Safety Review Committee Independence
05000458/FIN-2012010-06	2012Q3	P.5	Failure to Establish an Adequate Cable Reliability Program
05000458/FIN-2012010-05	2012Q3		Failure to Est Lockout Relays in Accordance with Vendor Testing Practices
05000458/FIN-2012010-04	2012Q3	H.5	Failue to Implement Effective Corrective Actions for Lockout Relay Failures
05000458/FIN-2012010-03	2012Q3	H.14	Failure to Establish an Adequate Controlling Procedure for Stroking Safety Relief Valves at LOW Power
05000458/FIN-2012010-02	2012Q3	H.14	Failure to Declare Reactor Core Isolation Cooling System Inoperable
05000458/FIN-2012010-01	2012Q3		Failure to Correct Spurious Isolation of Reactor Core Isolation Cooling System
05000458/FIN-2012009-03	2012Q3		Implementation of the Procedure for Infrequently Performed Tests or Evolutions
05000458/FIN-2012009-04	2012Q3		Corrective Action Program Implementation for Prior Lockout Relay Failure in February 2011
05000458/FIN-2012009-05	2012Q3		Implementation of Vendor and Industry Recommended Relay Testing and Maintenance
05000458/FIN-2012403-02	2012Q4		Security
05000458/FIN-2012403-01	2012Q4		Security
05000458/FIN-2012005-04	2012Q4	H.12	Failure to Follow Procedure for Lifting Leads Results in Inoperability of Standby Service Water Fan
05000458/FIN-2012005-03	2012Q4		Failure to Implement Effective Corrective Actions for Defects in Masterpact Breakers
05000458/FIN-2012012-02	2012Q4	P.4	Failure to Promptly Identify and Correct a Condition Adverse to Quality
05000458/FIN-2012005-02	2012Q4	P.2	Inadequate Procedures for Lubrication of the Standby Liquid Control Pump Motor Bearings
05000458/FIN-2012005-01	2012Q4		Failure to Maintain Design Control of the Control Building Chilled Water System
05000458/FIN-2012012-01	2012Q4	H.8	Failure to Identify and Correct a Condition Adverse to Quality
05000458/FIN-2012012-05	2012Q4	P.2	Failure to Correct the Maintenance Organizations Inadequate Procedure Use and Adherence
05000458/FIN-2012012-04	2012Q4	P.2	Failure to Correct an Identified Condition Adverse to Quality
05000458/FIN-2012012-03	2012Q4		Failure to Maintain Design Control of the Feedwater Control System
05000458/FIN-2013002-04	2013Q1	H.7	Failure to Properly Perform a Maintenance Activity
05000458/FIN-2013002-03	2013Q1	H.13	Failure of a Radiation Protection Technician to Provide Adequate Job Coverage
05000458/FIN-2013002-02	2013Q1	H.12	Failure to Request Briefings of the Dose Rates in HIGH-RADIATION Areas Before Entry
05000458/FIN-2013002-01	2013Q1		Failure to Monitor the Performance of the Floor and Equipment Drains System
05000458/FIN-2013202-01	2013Q2		Security
05000458/FIN-2013202-02	2013Q2		Security
05000458/FIN-2013404-02	2013Q2	H.14	Security
05000458/FIN-2013404-01	2013Q2	H.13	Security
05000458/FIN-2013003-02	2013Q2	P.4	Failure to Adequately Evaluate and Correct Degraded 125 Vdc Fused Disconnect Switches
05000458/FIN-2013003-01	2013Q2		Failure to Establish Effective Preventive Maintenance for Components Used in High Critical Applications

Self-Identified List (River Bend)

	Q	Title
05000458/FIN-2012005-05	2012Q4	Licensee-Identified Violation
05000458/FIN-2012005-06	2012Q4	Licensee-Identified Violation
05000458/FIN-2013003-03	2013Q2	Licensee-Identified Violation

[River Bend Findings full list]

05000458/FIN-2013003-02

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